Matrix: Norris/stomach

Description: S.Norris, Univ. Auckland. 3D electro-physical model of a duodenum

Norris/stomach graph Norris/stomach graph
(bipartite graph drawing) (graph drawing of A+A')


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  • Matrix group: Norris
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  • download as a MATLAB mat-file, file size: 22 MB. Use UFget(895) or UFget('Norris/stomach') in MATLAB.
  • download in Matrix Market format, file size: 33 MB.
  • download in Rutherford/Boeing format, file size: 29 MB.

    Matrix properties
    number of rows213,360
    number of columns213,360
    structural full rank?yes
    structural rank213,360
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 85%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorS. Norris
    editorT. Davis
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD57,474,334
    Cholesky flop count5.1e+10
    nnz(L+U), no partial pivoting, with AMD114,735,308
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD110,927,497
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD205,340,721

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.